Cylinder lock



F. E. BEST CYLINDER LOCK vJul s 1924.

Filed Feb. 14, 1922 GM 55M a i lg? Patented July 8, 1924.

UNITED STATES P T omen- FRANK E. BEST, or sEaTTLE, WASHINGTON. a 35w"-GYLINDER LOCK.

Application filed February 14, 1922.

To all whom it concern:

Be it known that I, FRANK Bnsr. a citizen of the United States, residingat Seattle, in the county of King and State of Washington, have inventedcertain new and useful Improvements in Cylinder Locks, of which thefollowing is a specification.

This invention relates to locks and more especially to door locks of thecylinder type,

it) and its object is the provision of simple and conveniently appliedmeans for removably securing the core assembly within the lockcylinders.

The invention in its preferred form is illustrated in the accompanyingdrawings, wherein Figure l is a side elevation of the lock cylinder; andFig. 2 is a similar view of the cylinder from the side diametricallyopposite to that in which it is shown in Fig. 1. Fig. 3 is an endelevation of Figs. 1 and 2, and shown partly broken away and partly insection.

In said drawings, the reference numeral 25 5 represents a housing ofcylindrical shape for a core-frame 6 having at one end a plate element,or face, which is integral with the frame 6. The core frame 6 ,containsthe key-plug 8 which carries the arm or throw 9 whereby the lock-bolt,not shown, is moved into and from its operative position.

The housing 5 is furthermore provided with external screw threads 10which are engageable with internal threads provided as usual in thelatch casing of the lock for securing the housing thereto against axialseparation. 11 represents longitudinal grooves provided in the peripheryof said housing, either of said grooves being adapted to be revolublybrought into position to receive any well known or suitable means forsecuring the housing from rotating.

The above named parts are or may be similar to devices hitherto employedin cylinder locks.

According to the present invention I provide novel devices for removablysecuring the core assembly within the casing. Such devices comprise aslotted set screw 12 taking in a screw threaded hole 13 provided in thecasing 5 and engaging the core frame '6. For convenience in manufacturethe hole 13 Serial No. 536,428.

is disposed radially of the upper cylinder axis. The screw 12 ispreferably provided with a rounded extremity 12 which protrudes from theinner end of the cylinder hole 13 and seats in a correspondingly shapedsocket 14 provided in the core frame whereby the latter is positivelyheld in pre determined axial relations with respect to the housing.

When in use the core housing 5, is secured within the lock case ormember in which it is installed, as shown in Fig. 2 so that there willbe no possibility of the screw 12 working or jarring loose and releasingthe core and so that access to the screw 12 will not be possible exceptby removal of the core housing from the lock case. The screw 12 beingarranged to engage with and project into a hole in the upper cylindricalportion of the substantially figure 8 shaped lock core will notinterfere in any way with the operation of the rotatable key plug 8which is disposed in the lower cylindrical portion of said core and maybe securely tightened so that it will hold the core rigid with respectto the core housing. The screw 12 entering a hole or indentation, not agroove, forms a positive lock that will be prevent removal of the core,as distinguished from so a the other screw shown in Fig. 3 which entersthe groove 11 in the core housing and only prevents the engaged memberfrom turning.

l/Vith my invention the core assembly is detachably secured to thehousing and may be readily removed from the latter by retracting the setscrew.

l/Vhat I claim, is,-

1. In a lock of the class described the combination with a core housinarranged to be inserted in a lock case and provided with a hole in oneside, of a core adapted to fit into said core housing and having anindentation arranged to register with said hole in said core housing anddetent means operable in said hole and arranged to enter saidindentation to retain said core in said core housing, access to saiddetent means being impossible when said core housing is within a lockcase.

2. In a lock of the class described, the combination with a core housingarranged to be inserted in a lock case and provided in one side with ascrew threaded hole, of a screw being prevented by insertion of saidcore adapted to fit into said core housing (ore housing into a lockcase. 10

and having an indentation arranged to reg- Signed at Seattle,Washington, this 8 day ister with said hole in said core housing of Feb,1922.

- and a screw arrangedto screw into the hole in said core housing andproject into the in- FRANI; EL BEST dentation in said core to detachably100k Witness: said core in said core housing, access to said LINTON- P.Bn qnn'rr.

